TW201502279A - Lead retaining purge plug - Google Patents

Abstract

A purge plug 110 containing a refractory material is configured to be inserted in the bottom of a ladle for introducing purging gas through a heat of molten metal in the ladle. The purge plug houses a retention chamber 120 for holding the lead content of lead-containing molten steel alloys that Ieaches into, or infiltrates into, the purge plug. The purging gas supply tube 38 is provided with a portion that protrudes into the retention chamber 120, thereby preventing the lead content of lead-containing molten steel alloys from entering and blocking the purging gas supply tube 38.

Description

Preserved lead rinse plug

The invention relates to a flushing plug comprising a refractory material constructed to be embedded in the bottom of the bucket to introduce the flushing gas through the molten metal of the charge located in the bucket.

In the steel manufacturing process, a container called a bucket is used which is lined with a refractory material to hold the molten steel. The flush plug is a device that is mounted in a passage through the exterior of the bucket and is constructed to introduce a gas into the interior of the bucket. The flushing plug can be combined with a hole or channel to allow gas to circulate. The function of the flushing plug is to provide gas agitation to the molten metal, thereby enhancing heat and chemical homogenization. The flushing gas can also be modified by the heat (the melt content of the bucket). This agitation is usually accomplished by percolating the argon or nitrogen through the flushing plug located at the bottom of the bucket. Typically, the flush plug has the shape of a ceramic truncated cone (frustum) and is sealed within the sheet metal housing.

In a typical construction, the flushing plug is alternatively disposed within a housing block that is mounted to the bottom of the bucket. In the bucket, various high temperature processes are performed, and the flush plug is a critical part. In the process, the uppermost portion of the flushing plug is severely worn, which is directly Facing the charge, and when its height has been reduced to the minimum allowable level, it is necessary to regularly replace the new flushing plug.

The porous flushing plug is known in the art. These flush plugs are designed to allow gas to pass through but do not allow molten steel to pass through. It requires high gas pressure to achieve proper gas flow, and this hole can result in increased wear of the flush plug.

Flushing the directional bore of the plug allows for increased airflow through the flush plug. Such a flush plug can be made more compact, but this will tend to result in a higher risk such that the steel in the flush plug will block the conduit that can provide the directional bore.

The flushing plug may contain slots or gaps formed by casting rather than piping. In fact, this design allows for increased gas flow, but does not completely rule out the possibility of steel seepage.

Successful flush plugs are required to have high durability, satisfactory gas permeability, and to prevent steel from seeping into the cracks in the flush plug. These three properties are necessary to make trade-offs.

In some steel grades (free-cut steel grades) it is necessary to add lead to the steel, and these lead may settle to the bottom of the bucket and penetrate through the flushing plug into the bottom attached to the flushing plug. In the pipeline. The solidified lead accumulated in these pipes will limit or completely block the flow of gas through the flushing plug.

An attempt to solve the above problem is to place a lead supplement in the flushing plug conduit by attaching a tee to the flushing plug conduit. The T-piece is constructed such that one opening has parallel axes and the other two openings have vertical The way the axis. The inert gas system flows horizontally into the tee and then turns in the tee to flow upward into the flushing plug, which is connected to the bottom of the tee. The lead will drip vertically down to the tee into the lead replenisher, which is a sealed conduit having a larger diameter. In the case where the lead supplement is already full of lead, it should be replaced. However, in the case of a safety mechanism that is usually placed directly under the flushing plug, in this case the lead supplement does not protect the safety mechanism. Lead in this safety mechanism can make the safety mechanism inoperable, and the lead in the mechanism must be melted out in order for the safety mechanism to be restarted for proper operation.

Accordingly, the present invention is a safety mechanism designed to prevent liquid lead from entering the conduit or any location beneath the flushing plug. The flushing plug is formed with a body, a terminal cover disposed under the body, and a collection volume disposed above the terminal cover and located in the body of the flushing plug. Metal can be radially surrounded around the flushing plug. A gas conduit extends through the terminal cover and projects into the collection volume. The protrusion of the gas conduit may allow it to collect lead at the bottom of the collection capacity and prevent lead from flowing into the gas conduit. In some constructions of the flushing plug, the refractory material is radially surrounding the collection volume to provide support for the flushing plug within the tub or may be present at the bottom end of the collecting capacity to support the terminal cap.

When the bucket is dumped, the liquid lead will flow out from the bottom end of the collection capacity and can be tested by the natural gas or inert gas flowing through the gas pipeline when tested in the entire area of the bucket. Pressed, and the flushing plug is sucked. The rinse plug of the present invention can therefore be characterized by automatic cleaning.

The size and geometry of the collection capacity, the extent to which the gas conduit extends into the collection capacity, and the diameter of the gas conduit can be adjusted based on the lead content of a particular steel grade or based on the volume of the bucket. Optimize the collection of lead. The collection capacity may be, for example, a cylindrical shape, a shape having a rectangular cylinder, two cylinders having a coaxial axis, and a cylindrical system having a smaller radius located above a cylinder having a larger radius, or a cylinder and a rectangle The combination of the cylinders.

10‧‧‧ rinse plug

12‧‧‧Refractory body

14‧‧‧ axis

16‧‧‧ Feeding end

18‧‧‧ Output

20‧‧ ‧ core

22‧‧‧ loss index

24‧‧‧ gas delivery structure

26‧‧‧Outside of the refractory body

28‧‧‧Feed end caps

30‧‧‧Inflatable Department

38‧‧‧ gas supply pipe

40‧‧‧T-piece

42‧‧‧ lead trap

110‧‧‧ rinse plug

120‧‧‧reserved chamber

124‧‧‧lateral volume

128‧‧‧ gas supply pipe projections

132‧‧‧Retaining the lower part of the chamber

136‧‧‧Retaining the upper part of the chamber

140‧‧‧ orifice gas supply pipe cap

141‧‧‧ check valve

210‧‧‧ rinse plug

232‧‧‧Retaining the lower part of the chamber

236‧‧‧Retaining the upper part of the chamber

1 is a cross-sectional view showing a prior art flushing plug in combination with a lead trap of the prior art; FIG. 2 is a cross-sectional view showing the flushing plug of the present invention; and FIG. 3 is a view showing the present invention A cross-sectional view of the flushing plug.

The flushing plug is formed of a refractory material and is generally of the shape of a cylinder, a truncated cone (frustum), or a truncated pyramid (frustum). Figure 1 shows the assembly in combination with the flush plug 10 of the prior art. The flushing plug is coupled to a longitudinal axis 14 having a feed end 16 and a delivery end 18 to form a refractory body 12. The flushing plug has a core 20 that may be constructed of a non-porous material or of a material having directional channels or holes formed in, for example, stamped and fired sheets. The loss indicator 22 selectively views the flush plug 10 from its output 18 and is wrapped around the core along the axis 14 20, and by its appearance or not to represent the degree of wear of the flushing plug 10. A gas delivery structure 24 is longitudinally disposed about the cone. It may be, for example, a slot, a tubular member of a porous material, or a passage between the feed end 16 and the output end 18, or may be formed in a pressed and fired plates. The material of the unidirectional gas through hole parallel to the axis 14. The refractory body outer portion 26 is a portion of the refractory body 12 disposed about the axis 14 and disposed outside the gas delivery structure 24. The refractory body outer portion 26 is partially or completely partially wrapped laterally in the metal housing. A feed end cap 28 is disposed on the feed end 16 of the flush plug 10 and at least partially overlies it. The feed end cap 28, when it is disposed on the feed end 16 of the flush plug 10, is constructed such that between the feed end cap 28 and the feed end 16, a plenum is defined 30. Feed end cap 28 is mated with gas supply tube 38 such that gas supply tube 38 is in fluid communication with plenum 30. The gas supply tube 38 is connected to the lead trap 42 by a T-piece 40. The T-piece 40 and the lead trap 42 are constructed such that liquid such as lead flowing into the gas supply tube 38 from the plenum 30 will pass through the T-piece 40 and be maintained in the lead trap 42.

In operation, the flushing plug is installed into a working position by introducing mortar between the side surface of the flushing plug and the inner surface of the block constructed to receive the side surface, so that the gas can pass The feed end of the rinse plug is supplied and introduced into the interior of the metallurgical vessel at the output of the flush plug. The block system is coated in the bottom or wall of the metallurgical vessel. The block system is typically arranged to be surrounded by a refractory material. The gas system is introduced through the gas supply pipe 38 and flows through The end cap 28 is fed into the inflator 30. The gas then flows from the feed end 16 of the flush plug 10 through the gas delivery structure 24 to the output 18 and thereby into the interior of the metallurgical vessel. The flush plug is introduced at the output 18, and the liquid lead that flows to the feed end 16 and enters the gas supply tube 38 can be supplemented by the lead trap 42.

Figure 2 shows an assembly incorporating the rinse plug 110 of the present invention. The flushing plug is combined with a refractory body 12 formed around a longitudinal axis 14 having a feed end or lower end 16, and an output end or upper end 18. The rinsing plug has a core 20 which may be composed of a non-porous material or a material having directional channels or holes formed in, for example, a pressure-fired plate. The loss indicator 22 selectively covers the flush plug 10 from its output 18 and is wrapped in the core 20 along the axis 14 and indicates the degree of wear of the flush plug 10 by its appearance. The gas delivery structure 24 is in fluid communication with the feed end 16 and the output end 18 and/or longitudinally disposed about the core or longitudinal axis. It may be, for example, a slot, a tubular member of a porous material, a channel, or a material comprising a unidirectional gas passage hole formed in a pressure-fired plate parallel to the axis 14. The refractory body outer portion 26 is a portion of the refractory body 12 disposed about the axis 14 and disposed outside the gas delivery structure 24. The refractory body outer portion 26 is partially or completely laterally wrapped or sealed in the metal housing. A feed end cap 28 is provided and at least partially overlies the feed end 16 of the flush plug 10. The feed end cap 28, when it is disposed on the feed end 16 of the flush plug 10, is constructed such that a retention chamber 120 is defined between the feed end cap 28 and the refractory body 12. The feed end cap 28 is fitted with the gas supply pipe 38 to make the gas supply pipe 38 is in fluid communication with the retention chamber 120. The gas supply tube 38 protrudes within the retention chamber 120. The transverse volume 124 is the portion of the retention chamber 120 that extends laterally to the outer portion 26 of the refractory body. In a particular embodiment of the invention, the lateral volume 124 is physically and compositionally integrated with the refractory body outer portion 26. In a particular embodiment of the invention, the transverse volume 124 is the portion of the retention chamber 120 that extends laterally, and the refractory body outer portion 26 is metal that at least partially covers the radial surface of the refractory body outer portion 26 The housing is attached to the feed end cap 28. The gas supply tube 38 protrudes into the range of the retention chamber 120, which divides the retention chamber 120 into two portions. The retention chamber lower portion 132 is a portion of the retention chamber 120 that extends below the extent that the gas supply tube 38 protrudes into the retention chamber 120. The upper portion 136 of the retention chamber is a portion of the retention chamber 120 that extends beyond the extent that the gas supply tube 38 projects into the retention chamber 120. The gas supply tube projections 128 extending into the retention chamber 120 may be uncapped, may be fitted with a bend or nozzle, or may be covered by an orifice gas supply tube cover 140. If the core 20 is constructed of a material that allows lead to flow, the orifice gas supply tube cover 140 can be constructed such that the orifice does not face the core 20 and is not located on the flow line of lead.

The gas supply tube protrusion 128 entering the retention chamber 120 may be provided with a bend including an angle from 90 degrees to 180 degrees, from 105 degrees to 180 degrees, from 120 degrees to 180 degrees, or below 180 degrees. In a particular embodiment of the invention, check valve 141 is disposed in gas supply tube 38. The check valve 141 is configured or constructed to allow flow into the retention chamber 120, but does not allow gas to flow from the retention chamber. Supply tube 38. This configuration may allow gas to flow through the gas supply tube 38 and into the retention chamber 120, but prevents molten metal from flowing from the retention chamber 120 into the gas supply tube 38.

In operation, the flushing plug is installed into a working position by introducing mortar between the side surface of the flushing plug and the inner surface of the block constructed to receive the side surface, so that the gas can pass The feed end of the rinse plug is supplied and introduced into the interior of the metallurgical vessel at the output of the flush plug. The block system is coated in the bottom or wall of the metallurgical vessel. The block system is typically arranged to be surrounded by a refractory material. The flushing plug entering the flushing plug at the output 18 and flowing to the feed end 16 is by the protruding configuration of the gas supply tube 38 within the retaining chamber 120, and in some configurations, by nozzle or The orifice gas supply tube cap 140 is present to prevent it from entering the gas supply tube 38.

The retention chamber 120 is constructed to contain all of the lead that would flow into it during the life of the flushing plug 110. Such a configuration is achieved by the proper range or length of the gas supply tube projections 128 and the appropriate retention chamber lower extent 132. Useful values for the gas supply tube projections are found to be at least 3 mm, at least 5 mm, at least 10 mm, at least 15 mm, or at least 20 mm. A useful ratio of the lower range of the linear retention chamber to the upper end of the linear chamber is found to be at least 1:1, at least 2:1, at least 3:1, or at least 4:1. The useful ratio of the volume of the retaining chamber below the extent of the gas supply tube projection to the volume of the retaining chamber above the extent of the gas supply tube projection is found to be at least 1:1, at least 2:1, at least 3:1 or at least 4:1. The volume below the range of the gas supply tube projection is found to be at least 50 Cubic centimeters, at least 60 cubic centimeters, at least 75 cubic centimeters, and at least 100 cubic centimeters.

Figure 3 shows the assembly in combination with the flushing plug 210 of the present invention. The flushing plug is combined with a refractory body 12 formed around a longitudinal axis 14 having a feed end or lower end 16, and an output or upper end 18. The rinse plug has a core 20 which may be comprised of a non-porous material or a material having directional channels or holes formed in, for example, pressed and fired plates. The loss indicator 22 selectively covers the flush plug 210 from its output 18 and is wrapped in the core 20 along the axis 14 and indicates the degree of wear of the flush plug 210 by its appearance. The gas delivery structure 24 is in fluid communication with the feed end 16 and the output end 18 and/or longitudinally disposed about the core or longitudinal axis. It may be, for example, a slot, a tubular member of a porous material, a channel, or a material comprising a unidirectional gas passage hole formed in a pressurized and fired plate parallel to the axis 14. The refractory body outer portion 26 is a portion of the refractory body 12 disposed about the axis 14 and disposed outside the gas delivery structure 24. The refractory body outer portion 26 is partially or completely laterally wrapped or sealed in the metal housing. A feed end cap 28 is provided and at least partially overlies the feed end 16 of the flush plug 210. The feed end cap 28, when it is disposed on the feed end 16 of the flush plug 210, is constructed such that between the feed end cap 28 and the refractory body 12, a retention chamber 120 is defined. The feed end cap 28 is mated with the gas supply tube 38 such that the gas supply tube 38 is in fluid communication with the retention chamber 120. The gas supply tube 38 protrudes within the retention chamber 120. The transverse volume 124 is such that the retention chamber 120 extends laterally to the outer portion 26 of the refractory body. part. In a particular embodiment of the invention, the lateral volume 124 is physically and compositionally integrated with the refractory body outer portion 26. In a particular embodiment of the invention, the transverse volume 124 is the portion of the retention chamber 120 that extends laterally, and the refractory body outer portion 26 is metal that at least partially covers the radial surface of the refractory body outer portion 26 The housing is attached to the feed end cap 28. In this embodiment, the retention chamber 120 includes two portions: a cylindrical retention chamber lower portion 232 having a radius R and a cylindrical retention chamber upper portion 236 having a radius r. The radius R is greater than the radius r. The gas supply tube projection 128 protrudes into the upper end portion 236 of the retention chamber. The gas supply tube projection 128 entering the retention chamber 120 may be uncapped, may be fitted with a bend, nozzle, or crimp or may be covered by an orifice gas supply tube cover 140. If the core 20 is constructed of a material that allows lead to flow, the orifice gas supply tube cover 140 can be constructed such that the orifice does not face the core 20 and is not located on the flow line of lead.

Various implementations:

The invention includes a flushing plug comprising a refractory body having a feed end, an output end, an outer side and a longitudinal axis; at least one gas delivery disposed in fluid communication with the feed end and the output end a retention chamber in fluid communication with the gas delivery structure and located at a feed end of the refractory body; and a gas supply tube in fluid communication with the retention chamber; and a gas supply tube projecting into the retention chamber unit. The gas supply tube projection has an axis, and the axis of the gas supply tube projection is parallel to the longitudinal axis of the refractory body. The gas supply pipe protrusion has an axis, and the gas is supplied The axis of the tubular projection is coaxial with the longitudinal axis of the refractory body. The structure of the gas supply tube projection is selected from the group consisting of a bend, a crimp, or a nozzle, and an orifice cover. The end of the gas supply tube projection is an orifice cover, and the orifice faces of the orifice cover are not perpendicular to the longitudinal axis of the refractory body. The gas delivery structure is selected from the group consisting of: a slot, a tubular member of a porous material, a passage, a bore formed in the castable material, and a unidirectional gas passage parallel to the longitudinal axis of the refractory body. A hole, a material comprising a unidirectional gas through hole formed in a pressurized and fired plate parallel to the longitudinal axis, and a combination of these structures. The flushing plug further includes a metal outer casing that at least partially covers the outer portion of the refractory body. The flushing plug further includes a feed end cap disposed over the refractory body feed end to define the retention chamber between the refractory body and the feed end cap, wherein the feed end The cover is fitted to the gas supply pipe. The projection of the gas supply tube extends to at least 3 mm, at least 5 mm, at least 10 mm, at least 15 mm, at least 20 mm, at least 25 mm, or at least 30 mm in the retention chamber. The gas supply tube has a termination point in the retention chamber, and the ratio of the volume of the retention chamber below the termination point to the volume ratio of the retention chamber above the termination point is at least 1:1, at least 2:1, at least 3:1, or at least 4:1. The retention chamber includes a cylindrical upper end portion having a radius r, and a cylindrical lower end portion having a radius R, the r system being smaller than R, and the gas supply tube protrusion is protruded into the retention chamber In the cylindrical upper end portion of the chamber. The gas supply pipe includes a check valve. The check valve is configured or constructed to allow flow into the retention chamber, but does not allow flow from the retention chamber into the gas supply tube.

Many modifications or variations are possible in the present invention. Therefore, it is to be understood that the invention may be practiced otherwise than as specifically described in the scope of the appended claims.

10‧‧‧ rinse plug

12‧‧‧Refractory body

14‧‧‧ axis

16‧‧‧ Feeding end

18‧‧‧ Output

20‧‧ ‧ core

22‧‧‧ loss index

24‧‧‧ gas delivery structure

26‧‧‧Outside of the refractory body

28‧‧‧Feed end caps

30‧‧‧Inflatable Department

38‧‧‧ gas supply pipe

40‧‧‧T-piece

42‧‧ lead trap

Claims (18)

A flushing plug comprising: a refractory body having a feed end, an output end, an outer portion and a longitudinal axis; at least one gas delivery structure disposed to be coupled to the feed end and the The output is in fluid communication; a retention chamber in fluid communication with the gas delivery structure and being tethered at the feed end of the refractory body; and a gas supply tube in fluid communication with the retention chamber And having a gas supply tube projection protruding into the retention chamber. The flushing plug of claim 1, wherein the gas supply tube projection has an axis, and the axis of the gas supply tube projection is parallel to the longitudinal axis of the refractory body. The flushing plug of claim 2, wherein the gas supply tube projection has an axis, and an axis of the gas supply tube projection is coaxial with a longitudinal axis of the refractory body. The flushing plug of claim 1, wherein the structure of the terminal end of the gas supply tube is selected from the group consisting of an elbow, a crimp, a nozzle, and an orifice cover. The flushing plug of claim 4, wherein the gas supply tube projection end is an orifice cover, and wherein the orifice surface of the orifice cover is not perpendicular to the longitudinal axis of the refractory body. The flushing plug of claim 1, wherein the gas delivery structure is selected from the group consisting of: a slot, a tube of porous material, The passage, the void formed in the castable material, the unidirectional gas through-hole including the parallel to the longitudinal axis of the refractory body and formed in the pressure-fired plate, and a combination of these structures. The flushing plug of claim 1 further comprising a metal outer casing at least partially covering the outer portion of the refractory body. The flushing plug of claim 1 further comprising a feed end cap disposed on the feed end of the refractory body to define the between the refractory body and the feed end cap A chamber is retained, wherein the feed end cap engages the gas supply tube. The flushing plug of claim 1 wherein the gas supply tube projection extends into the retention chamber by at least 5 millimeters. The flushing plug of claim 1 wherein the gas supply tube projection extends into the retention chamber by at least 10 millimeters. The flushing plug of claim 1 wherein the gas supply tube projection extends into the retention chamber by at least 15 mm. The flushing plug of claim 1 wherein the gas supply tube projection extends into the retention chamber by at least 20 millimeters. The flushing plug of claim 1, wherein the gas supply tube has a termination point in the retention chamber, and wherein the retention chamber is lower than the volume of the termination point, and the retention chamber is higher than the termination point The ratio of volume is at least 1:1. The flushing plug of claim 1, wherein the gas supply tube has a termination point in the retention chamber, and wherein the retention chamber is lower than the volume of the termination point, and the retention chamber is higher than the termination point The ratio of the volume is at least 2:1. The flushing plug of claim 1, wherein the gas supply tube has a termination point in the retention chamber, and wherein the retention chamber is lower than the volume of the termination point, and the retention chamber is higher than the termination point The ratio of the volume is at least 3:1. The flushing plug of claim 1, wherein the gas supply tube has a termination point in the retention chamber, and wherein the retention chamber is lower than the volume of the termination point, and the retention chamber is higher than the termination point The ratio of the volume is at least 4:1. The flushing plug of claim 1, wherein the retaining chamber comprises a cylindrical upper end portion having a radius r, and a cylindrical lower end portion having a radius R; wherein r < R; and wherein the gas supply tube The protruding portion protrudes into the cylindrical upper end portion of the retaining chamber. The flushing plug of claim 1, wherein the gas supply conduit has a termination point in the retention chamber, and wherein the gas supply conduit includes a check valve.